Waste Water Engineering
Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is?

None of these
Reciprocating pump
Pneumatic ejector
Centrifugal pump

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Waste Water Engineering
Pick up the incorrect statement from the following for allowing workers to enter sewers

Proper tests for the presence of poisonous gases must be carried out
The men entering the manhole should be advised to smoke in the sewer
Warning signals should be erected
The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes

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